Laboratory measurement of nearshore velocities and erosion of cohesive sediment (till) shorelines

摘要

The evolution of shorelines composed of consolidated cohesive sediments is dominated by irreversible erosion. In this note, measurements, under laboratory conditions, of bottom velocities, wave heights, and breaking characteristics over an actively eroding consolidated cohesive sediment shore are reported. Erosion is enhanced under breaking conditions, and plunging breakers are markedly more erosive than spilling breakers. The turbulence at the outer edge of the breaking zone has the - 5/3 power high frequency dependence indicative of the inertial subrange.